It hasn't been officially announced just yet but it does appear to be true.
If you check a recently released FAQ for the upcoming Dead Island 2 beta, you'll find something interesting:
It seems Yager's open-world zombie-slasher will enter an exclusive test phase on PlayStation 4. It's a 30-day timed exclusivity for the beta; it was initially discovered by players who pre-ordered the recent Escape Dead Island spin-off from GameStop. They got a bonus code for the Dead Island 2 beta and when they went to redeem it, they got a message that read:
"Those who have selected PS4 as their platform of choice for the Dead Island 2 beta will receive access 30 days before Xbox One and PC users."
We don't know when this beta will begin but it's nice to know that PS4 owners get the nod with this one. The game is quite promising, too!
Related Game(s): Dead Island 2